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Summary of Significant Accounting Policies - Cash and Restricted Cash (Details) (USD $)
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12 Months Ended | |
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Dec. 31, 2014
restricted_cash_account
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Dec. 31, 2013
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| Restricted Cash and Cash Equivalents Items [Line Items] | ||
| Uninsured cash amounts | $ 904,000,000 | |
| Number of restricted cash accounts | 4 | |
| New York State Racing, Pari-Mutual Wagering And Breeding Law [Member] | ||
| Restricted Cash and Cash Equivalents Items [Line Items] | ||
| Restricted cash and cash equivalents | 49,000 | 42,000 |
| Monticello Harness Horsemens Association [Member] | ||
| Restricted Cash and Cash Equivalents Items [Line Items] | ||
| Restricted cash and cash equivalents | 806,000 | 229,000 |
| VGM New York Governing Law [Member] | ||
| Restricted Cash and Cash Equivalents Items [Line Items] | ||
| Restricted cash and cash equivalents | 405,000 | 399,000 |
| Minimum reserve balance | $ 450,000 | $ 400,000 |